JPH07159079A - Heat exchanging device - Google Patents

Abstract

PURPOSE:To raise a heat efficiency by providing a first exhaust gas convergence means for collecting a combustion exhaust gas on a surface of the upstream side of a flow of the exhaust gas with respect to a water passing tube, and a second exhaust gas convergence means for exhausting the combustion exhaust gas from the first exhaust gas convergence means after collecting it at the downstream side surface of the exhaust gas flow with respect to the water passing tube. CONSTITUTION:As guide plates 5, 5 are each other made to be in a closely contact state, a combustion exhaust gas sent into a heat exchanging section 1b executes an inflow from an open section 51, contacts the upper face of a water passing tube 11 and executes an inflow among a guide plate 5, a water passing tube 11 and a fin 12. This combustion exhaust gas is exhausted from an open section 52 at the underside direction of the water passing tube 11, and contacts the underface of the water passing tube 11 at this time. Accordingly, a combustion gas is condensed, in a heat exchanging section 1b, by a contact action of the combustion exhaust gas over all circumferential periphery of the water passing tube 11 and the fin 12 and a heat efficiency is raised. A drain adhering to the upper section of an outside wall of the guide plate 5 enters the inside through a pierced hole 55 and flows downwards from the open section 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange device having a heat absorbing water pipe arranged in an exhaust passage from a combustion device.

[0002]

2. Description of the Related Art As shown in FIG. 7, a gas burner (3) and a two-stage heat exchanger (1) are combined as a heat exchange device for improving the efficiency of heat exchange from combustion exhaust gas. There is something. The heat exchanger (1) is composed of a water pipe (11), a large number of fins (12) (12) provided on the outer periphery of the water pipe (11), and a can body (6) accommodating them. The device (1) consists of a main heat exchange part (1a) that absorbs the sensible heat of the combustion exhaust of the gas burner (3) on the downstream side of the water pipe (11) and a water pipe (11) arranged below it. It is mainly composed of an auxiliary heat exchange part (1b) which absorbs latent heat of combustion exhaust gas of the gas burner (3) on the upstream side. And below the heat exchanger (1), the heat exchanger
A drain discharge port (8) is provided for discharging the drain attached to (1) to the outside.

The flame hole portion of the gas burner (3) is set downward, and the main heat exchange portion (1a) is arranged near the flame forming region. And the gas burner
Combustion air is forced to be supplied to (3) by a fan (4), which allows the combustion exhaust of the gas burner to pass through the main and auxiliary heat exchange sections (1a) and (1b). After that, the gas is discharged to the outside through the exhaust pipe (21) below this.

In this case, when the gas burner (3) is burned and tap water is supplied from the water pipe (11) located on the side of the sub heat exchange portion (1b), the water in the water pipe (11) is Gas burner (3)
The amount of heat generated by the heat is absorbed from the water pipes (11) and fins (12) (12), and becomes hot water that is taken out from the main heat exchange section (1a) to the outside. The exchange section (1a) mainly acts to absorb the sensible heat of the combustion exhaust gas of the gas burner (3), and the auxiliary heat exchange section (1b) mainly condenses water vapor in the combustion exhaust gas of the gas burner (3). The latent heat is absorbed. That is, in the sub heat exchange section (1b), drainage is generated by cooling the sensible heat depleted and cooled combustion exhaust gas to a temperature below its dew point temperature, and latent heat at that time is generated to the sub heat exchange section (1b). The water in the water pipe (11) in the is absorbing heat. And the sub heat exchange section (1b)
The drain attached to the sub-heat exchange section (1
It drips below b) and is discharged to the outside from the drain discharge port (8). In this case, not only the sensible heat of the combustion exhaust gas but also the latent heat is positively absorbed in the heat exchange section, so that there is an advantage that the thermal efficiency is improved.

However, this one cannot sufficiently improve the thermal efficiency. Combustion exhaust gas sent to the heat exchanger (1) is a water pipe in the heat exchanger (1).
All of the combustion exhaust gas from the gas burner (3) does not come into contact with the upper surface of the water pipe (11) because it flows evenly into the portion (11) and the space between these water pipes. Also, water pipe (11)
Because the lower surface side of is behind in the flow of the exhaust flow,
The combustion exhaust gas stagnates on the lower surface side, and fresh combustion exhaust gas does not flow into the relevant portion. For these reasons, not all of the combustion exhaust gas comes into effective contact with the water pipe (11) for heat exchange, and in this respect, the thermal efficiency cannot be sufficiently improved.

The same inconvenience as described above also occurs in the type in which the heat exchanger (1) is arranged on the downstream side of the combustion exhaust passage above the gas burner (3) as shown in FIG. An object of the present invention is to improve the thermal efficiency in such a “heat exchange device having a water passage pipe (11) for absorbing heat in the exhaust passage from the combustion device”. [Invention of Claim 1]

[0007]

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problems are as follows: "First exhaust gas concentrating means (A) for collecting combustion exhaust gas on the surface of the water flow pipe (11) on the upstream side of the exhaust gas flow. )
And combustion exhaust gas from the first exhaust gas concentration means (A) (1
The second exhaust gas concentrating means (B) for collecting and discharging the exhaust gas flow on the downstream surface in 1) is provided ”.

[0008]

The above technical means of the present invention operates as follows. The combustion exhaust gas generated by the combustion device contacts the water flow pipe (11), and the amount of heat in the combustion exhaust gas is exchanged with the water flow in the water flow pipe (11). At this time, as shown in the conceptual diagram of FIG. 1, not only the combustion exhaust flowing toward the water pipe (11) but also the combustion exhaust supplied to a portion further away from the water passage (11) is the first exhaust concentration means.
It will be collected in the water pipe (11) by (A). That is, the combustion exhaust gas is collected toward the surface of the water flow pipe (11) facing the upstream side of the exhaust flow, whereby the combustion exhaust gas is intensively blown to the surface portion of the water flow pipe (11). And the first
The combustion exhaust blown from the exhaust gas concentrator (A) to the surface of the water pipe (11) flows to the side of the water pipe (11) and then flows to the side of the water pipe (11) by the second exhaust gas concentrator (B). The back part, that is,
After being collected on the downstream surface of the exhaust flow in the water pipe (11), it is discharged. Thus, the combustion exhaust from the combustion device is blown to the upstream surface of the water pipe (11), then flows from the side surface to the downstream surface, and then is concentrated from the exhaust flow downstream surface. Will be discharged. From this, according to the above technical means, the water pipe (1
The amount of combustion exhaust that contacts 1) increases, and the contact time between the exhaust flow and the water pipe (11) increases.

[0009]

[Effect] The present invention having the above-mentioned structure has the following unique effects. Since the amount of combustion exhaust gas contacting the water flow pipe (11) increases and the contact time between the exhaust flow and the water flow pipe (11) increases, the heat efficiency of the heat exchange device is improved. [Regarding the invention of claim 2] The technical means of the invention of claim 2 is the "first exhaust gas concentrating means" in the invention of claim 1.
Exhaust guide means (C) for guiding combustion exhaust along the cross-section side wall of the water pipe (11) between (A) and the second exhaust gas concentrating means (B) are arranged on opposite sides of the water pipe (11) in cross section. I did that.

According to the present invention, as in the first aspect of the present invention, the combustion exhaust gas is upstream of the exhaust flow in the water pipe (11) by the first exhaust gas concentrating means (A) and the second exhaust gas concentrating means (B). Collected on the surface and the downstream surface. In this case, in the invention of claim 2, the exhaust gas guide means (C) for guiding the combustion exhaust gas along the side wall of the cross section of the water pipe (11) is provided with the first exhaust gas concentrating means (A) and the second exhaust gas concentrating means (A).
Since the water pipe (11) and the exhaust gas concentrating means (B) are arranged to face each other on both sides of the cross section, as shown in the conceptual diagram of FIG. 2, the combustion exhaust gas from the first exhaust gas concentrating means (A) is Exhaust guide means
(C) is supplied to the upstream end portion of the water guide pipe (11) while reliably contacting the exhaust pipe (11) and the water pipe.
It will flow toward the downstream end between (11).

Therefore, in this structure, when the combustion exhaust gas from the combustion device passes through the water pipe (11), in addition to the action of the invention of claim 1, the side surface of the water pipe (11) has Since the combustion exhaust gas is surely brought into contact with each other, the water pipe
Since the amount of combustion exhaust gas contacting (11) is further increased and the contact time between the exhaust flow and the water pipe (11) is longer, the thermal efficiency is further improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment shown in FIG. 3, the present invention is applied to a water heater having a heat exchanger (1) having a function of condensing combustion exhaust gas and absorbing its latent heat. This one has a can body (6) that constitutes the heat exchanger (1) at the bottom of the water heater,
An air supply box (7) provided with a perforated plate type gas burner (3) on the upper part of the can body (6) and an air supply chamber (42) on the upper part is arranged. A gas nozzle (31) faces the air supply chamber (42), and a fan is provided above the air supply chamber (42).
(4) is provided. An exhaust pipe (21) is connected to the lower end opening of the heat exchanger (1).

The heat exchanger (1) is mainly composed of a gas burner (3).
The main heat exchange part (1a) which absorbs the sensible heat of the combustion exhaust gas, and the sub heat exchange part (1b) which is arranged below it and mainly absorbs the latent heat of the combustion exhaust gas of the gas burner (3). Cage,
One main heat exchange part (1a) consists of a water pipe (11) equipped with annular fins (12) (12), and the other sub heat exchange part (1b) is a main heat pipe in the water pipe (11). This is a configuration in which annular fins (12) and (12) are provided on the upstream side of the exchange section (1a). The drain generated in the sub heat exchange section (1b) is discharged to the outside from the drain discharge port (8) below the can body (6).

In this embodiment, the water flow pipe (11) in the main heat exchange section (1a) is composed of three stages, and each stage is meandered in two horizontal rows or three rows. Sub heat exchange part
The water pipe (11) of (1b) has a one-stage configuration in which the water pipe (11) is bent in a meandering shape in three horizontal rows. And the water pipe (11) on the side of the sub heat exchange part (1b)
The tap water is supplied from (the lowermost part of the water pipe (11)) and the water pipe (11) on the main heat exchange part (1a) side (the uppermost part of the water pipe (11))
I try to get hot water out of it.

On both sides of the cross section of the water pipe (11) in the sub heat exchange section (1b), guide plates (5) (5) having arcuate cross sections are provided.
Are arranged concentrically with the fins (12) (12) of the above, and a predetermined space is formed between these fins (12) (12) and the guide plates (5) (5). . As shown in FIG. 4, the upper and lower ends of the pair of guide plates (5) and (5) surrounding the water pipe (11) are spaced apart from each other by a distance smaller than the outer diameter of the water pipe (11). Facing each other, which results in an opening above the water pipe (11).
(51) and (51) are formed, and open parts (52) and (52) are formed below the water pipe (11). It should be noted that the vertical center portions of the guide plates (5), which are formed in an arcuate cross section, and the central portion and the inner wall of the can body (6) substantially block the flow of combustion exhaust gas. Close Further, each guide plate (5) is provided with a plurality of through holes (55) (55) slightly above the center in the vertical direction.

Therefore, if forced air is supplied from the fan (4) and gas is supplied from the gas nozzle (31) to burn the gas burner (3) and tap water is supplied from the lowermost part of the water pipe (11). , A gas burner similar to the conventional one
The combustion exhaust gas generated in (3) is the main heat exchange part of the heat exchanger (1).
(1a) → Sub heat exchange section (1b) → Exhaust pipe (21) and then discharged to the outside. On the other hand, the water in the water flow pipe (11) of the main heat exchange part (1a) and the sub heat exchange part (1b) is the amount of heat generated by the gas burner (3).
It is absorbed from (11) and fins (12) and (12), and becomes hot water from the uppermost part of the water pipe (11) and is taken out to the outside. Among the endothermic action at this time, the action of absorbing the sensible heat of the combustion exhaust of the gas burner (3) is mainly performed in the main heat exchange section (1a),
In the sub heat exchange part (1b), the action of mainly condensing the combustion exhaust gas of the gas burner (3) and absorbing the latent heat thereof is performed.
That is, in the auxiliary heat exchange unit (1b), drainage is generated mainly by cooling the combustion exhaust gas that has been deprived of sensible heat and cooled to a temperature below its dew point temperature, and the latent heat at that time is used to generate latent heat at that time. The water in the water pipe (11) located at () is absorbed.

At this time, the open portions (51) (5) above the water pipe (11)
Except for 1), since the guide plates (5) and (5) are in close contact with each other, the combustion exhaust sent to the sub heat exchange section (1b) is
Concentrated inflow from the open parts (51) (51) is brought into contact with the upper surface of the water pipe, and the guide plates (5) (5) and the water pipe (11) and the fins (12) (12) are connected. Flows in between. Then, since the shape of the guide plates (5) (5) is an arcuate cross section, the space between the guide plates (5) (5) and the water pipe (11), etc. Since it is formed in a shape that follows the outer shape, the combustion exhaust gas will flow through the water pipe.
It will surely flow along the outer peripheral surface such as (11). Then, the combustion exhaust gas is released from the open portions (52) (52) below the water pipe (11).
And is in contact with the lower surface of the water pipe (11) at this time. Therefore, in the embodiment, in the auxiliary heat exchange section (1b), as described above, by the effective contact action over the entire circumference of the water pipe (11) and the fins (12) (12) for the combustion exhaust gas. The combustion gas is condensed without waste, which improves the thermal efficiency. Due to this condensing action, drainage is generated in the sub heat exchange part (1b), but drainage adhering to the water pipe (11) and fins (12) (12) passes through the open parts (52) (52). Drain dripping below it, and the drain attached to the upper part of the outer wall of the guide plates (5) (5) enters through the through holes (55) (55),
Since it flows down from the open parts (52) (52), the drain does not stay in the sub heat exchange part (1b). In the above embodiment, the upper half of the guide plates (5) and (5) installed inside the can body (6) corresponds to the first exhaust gas concentrating means (A) described in the technical means section. At the same time, the lower half of the guide plates (5) (5) corresponds to the second exhaust concentration means (B), while the entire guide plates (5) (5) corresponds to the exhaust guide means (C).

The above embodiment can be modified as follows. ． In the above embodiment, each guide plate (5) is formed in an arcuate cross section, but it may be formed in a "dogleg" cross section as shown in FIG. Even in such a case, the upper half of the guide plates (5) and (5) installed in the can body (6) is the first part described in the section of technical means.
In the exhaust gas concentration means (A), the lower half of the guide plates (5) (5) corresponds to the second exhaust gas concentration means (B), while the entire guide plates (5) (5) become the exhaust gas guide means (C). Equivalent to.

Further, as shown in FIG. 6, the corrugated plates (5a) (5a) are
You may arrange | position on the both sides of the cross section of the water flow pipe (11) in a subheat exchange part (1b). In this case, the combustion exhaust gas collides with the uneven surface of the corrugated plates (5a) (5a) and is collected on the side of the water pipe (11), whereby the thermal efficiency is improved. In this structure, the upper half of the corrugated plates (5a) (5a) corresponds to the first exhaust concentration means (A) and the lower half corresponds to the second exhaust concentration means (B). ． The present invention mainly absorbs sensible heat in the main heat exchange section (1a), and a heat exchanger of the type that mainly absorbs latent heat in the auxiliary heat exchange section (1b), as well as the main heat exchange section (1a). It is also possible to adopt a type in which only the sensible heat is absorbed and the latent heat is mainly absorbed in the sub heat exchange section (1b). In either case, the main heat exchange section (1
The invention may be implemented in a). ． In the above embodiment, the water pipe (11) is bent in a meandering manner to form a four-stage structure, in which the lowermost stage is the sub heat exchange part (1b) and the other three stages are the main heat exchange parts. Although (1a) is adopted, the auxiliary water exchange pipe (11b) of the auxiliary heat exchange part (1b), which absorbs latent heat depending on the sensible heat absorbing capacity of the main heat exchange part (1a), is a two-stage or three-stage structure from the bottom. There are multiple stages.

In this way, when the sub heat exchange section (1b) is constructed in a plurality of stages, water may be supplied from the water pipe (11) at the second or third stage from the bottom. Further, including the case of the above embodiment, the hot water may be taken out from the second or third stage from the top. ． In the above embodiment, the fan (4) is provided on the air supply passage side, but it may be provided on the exhaust passage (21) side. ． Although the present invention is applied to the water heater in the above embodiments, the present invention can be applied to a heat exchange device such as a heater that circulates heated water in addition to the water heater. In any of the above cases, the heat exchanger included in the heat exchange device may be of a type having only the function of absorbing the sensible heat in the combustion exhaust gas. ． In order to smoothly drop the drain from the open portions (52) (52), a hanging piece may be hung from the lower end edges of the guide plates (5) (5) at the periphery of the open portions (52) (52).

[Brief description of drawings]

FIG. 1 is a conceptual diagram of the invention of claim 1.

FIG. 2 is a conceptual diagram of the invention of claim 2;

FIG. 3 is an explanatory diagram of an embodiment of the present invention.

[Fig. 4] Illustration of guide plates (5), (5)

FIG. 5 is an explanatory view of another example of the guide plates (5) and (5).

FIG. 6 is an explanatory view of corrugated plates (5a) (5a)

FIG. 7 is an explanatory diagram of a conventional example.

FIG. 8 is an explanatory diagram of another conventional example.

[Explanation of symbols]

 (11) ・ ・ ・ Water pipe (A) ・ ・ ・ First exhaust concentration means (B) ・ ・ ・ Second exhaust concentration means (C) ・ ・ ・ Exhaust guide means

Claims (2)

[Claims] 1. A water exchange pipe (11) in a heat exchange device having a water absorption pipe (11) for absorbing heat in an exhaust passage from a combustion device.
First exhaust gas concentrating means (A) for collecting the combustion exhaust gas on the upstream surface of the exhaust gas flow, and the combustion exhaust gas from the first exhaust gas concentrating means (A) on the downstream side of the exhaust gas flow in the water pipe (11) A heat exchange device comprising a second exhaust concentrating means (B) for collecting and discharging on the surface. 2. An exhaust guide means (C) for guiding combustion exhaust along a cross-section side wall of a water pipe (11) between the first exhaust concentrating means (A) and the second exhaust concentrating means (B). The heat exchange device according to claim 1, wherein the water pipes (11) are arranged to face each other on both sides of the cross section.